Article
Multidisciplinary Sciences
Kosuke Nakayama, Koshin Shigekawa, Katsuaki Sugawara, Takashi Takahashi, Takafumi Sato
Summary: The study reveals that electronic interactions within the FeSe layers have a significant impact on the high-temperature superconductivity in electron-doped FeSe. In the superconducting state, band dispersion shows highly anisotropic pairing characteristics, possibly related to small momentum transfer and electron-boson coupling.
Article
Physics, Multidisciplinary
Zhi Wang, Liang Dong, Cong Xiao, Qian Niu
Summary: The theory explores the rich contents of Berry curvature effects in the semiclassical dynamics of superconducting quasiparticles by tracking their wave packet motion in the phase space. These effects have a significant influence on the spectroscopic and transport properties of superconductors, such as the local density of states and the thermal Hall conductivity. As a model case, the theory is applied to investigate twisted bilayer graphene with a d(x2+y2) + id(xy) superconducting gap function, demonstrating the induced effects of Berry curvature.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Condensed Matter
J. M. Wilde, A. Sapkota, Q-P Ding, M. Xu, W. Tian, S. L. Bud'ko, Y. Furukawa, A. Kreyssig, P. C. Canfield
Summary: The magnetic order of Mn-doped CaK(Fe1-xMnx)(4)As-4 compounds is consistent with the hedgehog spin vortex crystal (hSVC) order found in Ni-doped CaKFe4As4. The hSVC state is characterized by stripe-type propagation vectors and simple antiferromagnetic stacking. The hSVC state in Mn-doped 1144 compound coexists with superconductivity and shows a quantum phase transition associated with the suppression of the AFM transition temperature.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
C. Vaswani, J. H. Kang, M. Mootz, L. Luo, X. Yang, C. Sundahl, D. Cheng, C. Huang, R. H. J. Kim, Z. Liu, Y. G. Collantes, E. E. Hellstrom, I. E. Perakis, C. B. Eom, J. Wang
Summary: The study identifies a hybrid Higgs mode in iron-based high-temperature superconductors and demonstrates its quantum control by light. The tunable coherent oscillation of the complex order parameter in these superconductors suggests the appearance and control of the Higgs mode through light tuning of interband interaction.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Rui-Xing Zhang, S. Das Sarma
Summary: The quasi-two-dimensional thin films of iron-based superconductors have been established as a new high-temperature platform for hosting intrinsic time-reversal-invariant helical topological superconductivity. Experimental results have shown that an applied electric field can serve as a topological switch for helical Majorana edge modes in FeSC thin films.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
H. Pfau, M. Yi, M. Hashimoto, T. Chen, P-C Dai, Z-X Shen, S-K Mo, D. Lu
Summary: The study investigates the influence of electronic nematicity on quasiparticle coherence in detwinned FeSe using ARPES, finding an anisotropy between dxz and dyz orbitals and a more coherent dxz orbital compared to the dyz orbital. This observation contrasts with earlier predictions and underscores the importance of electronic correlations in describing nematicity.
Article
Materials Science, Multidisciplinary
Areg Ghazaryan, Ammar Kirmani, Rafael M. Fernandes, Pouyan Ghaemi
Summary: We demonstrate the formation of robust zero-energy modes near magnetic impurities in the iron-based superconductor FeSe1-xTex. The Zeeman field generated by the impurity favors spin-triplet interorbital pairing over the spin-singlet intraorbital pairing found in the bulk. The preferred spin-triplet pairing preserves time-reversal symmetry and exhibits topological properties, with robust, topologically protected zero modes emerging at the boundaries between different pairing states.
Article
Nanoscience & Nanotechnology
D. A. Khokhlov, R. S. Akzyanov
Summary: In this study, theoretical investigation of quasiparticle interference in superconducting topological insulators reveals that interference patterns exhibit nematic behavior for small bias voltages and are sensitive to the orientation of the nematicity. The violation of rotational symmetry is observed in both coordinate and momentum spaces, with interference patterns resembling those of the normal state when the bias voltage is comparable to the order parameter value. The results are compared with existing experimental data.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Peng Fan, Hui Chen, Xingtai Zhou, Lu Cao, Geng Li, Meng Li, Guojian Qian, Yuqing Xing, Chengmin Shen, Xiancheng Wang, Changqing Jin, Genda Gu, Hong Ding, Hong-Jun Gao
Summary: We demonstrate the manipulation of Abrikosov vortices on the surfaces of Fe(Te,Se) and LiFeAs by utilizing one-dimensional wrinkles and low-temperature scanning tunneling microscopy/spectroscopy (STM/S). The wrinkles trap the Abrikosov vortices induced by the external magnetic field, and we are able to tailor and manipulate the wrinkles using an STM tip. Surprisingly, we show that the pinned vortices move together with these wrinkles even at high magnetic field up to 6 T. This work provides a universal and effective method for manipulating wrinkle-pinned vortices and simultaneously measuring the local density of states on the surfaces of iron-based superconductors.
Article
Physics, Multidisciplinary
Jong Hyuk Kim, Mi Kyung Kim, Jae Min Hong, Hyun Jun Shin, Ki Won Jeong, Jin Seok Kim, Kyungsun Moon, Nara Lee, Young Jai Choi
Summary: In this study, the magnetic anisotropy of the non-collinear antiferromagnet EuCo2As2 was investigated using torque magnetometry and an easy-plane anisotropic model. The detailed spin configurations that evolve in the presence of rotating magnetic fields were visualized, providing an in-depth understanding of the anisotropic properties of noncollinear-type antiferromagnets.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Peter Vancso, Alexandre Mayer, Peter Nemes-Incze, Geza Istvan Mark
Summary: The paper introduces two calculation methods based on wave packet dynamics for studying the physical properties of materials under the influence of structural defects. By experimental verification, these methods can be used to study quasiparticle scattering and interference effects on 2D materials.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Wenyong Zhang, Balamurugan Balasubramanian, Yang Sun, Ahsan Ullah, Ralph Skomski, Rabindra Pahari, Shah R. Valloppilly, Xing-Zhong Li, Cai-Zhuang Wang, Kai-Ming Ho, David J. Sellmyer
Summary: Heusler compounds and alloys based on them have attracted great interest due to their diverse spin structures, magnetic properties, and electron transport phenomena. Our study reveals a noncoplanar spin structure and strong topological Hall effect in the Ru2Mn0.8Sn1.2 alloy.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
Andrea Masi, Achille Angrisani Armenio, Giuseppe Celentano, Aurelio La Barbera, Alessandro Rufoloni, Enrico Silva, Angelo Vannozzi, Francesca Varsano
Summary: The study introduces a novel synthesis route for producing CaKFe4As4 compound through a combination of mechanochemical treatment and mild thermal process. The high energy ball milling step facilitates the reaction among pure elements, leading to the observation of a 1144 nanostructured phase. The mechanochemical activation effectively lowers the synthesis temperature and chemical variations in the starting composition have limited influence on the superconducting properties of the samples.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Smritijit Sen, Houria Kabbour, Haranath Ghosh
Summary: We have discovered a hydrostatic pressure-driven tetragonal to collapsed tetragonal transition in ThMnAsN accompanied by simultaneous magneto-structural and insulator to metal transition. The structural parameters, magnetism and electronic structures of ThMnAsN show significant changes with increasing hydrostatic pressure. The pressure-induced modifications in the local structural correlations destroy the usually localized nature of Mn moments. The compound remains dynamically stable at higher pressures and the critical value of the pressure for the phase transition remains robust.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
G. M. Pugliese, L. Simonelli, L. Tortora, G. Tomassucci, A. Iyo, H. Eisaki, T. Mizokawa, N. L. Saini
Summary: We have studied the local structure of La0.5-xNa0.5+xFe2As2 superconductor and found a significant change in the structure around the arsenic atom with hole doping. The As-Fe bond becomes stronger with hole doping, while the axial As-Asa bond tends to weaken in the optimally doped regime. These results suggest the importance of electron-lattice coupling and axial As atom displacements in the superconductivity of these iron-based materials.
Article
Nanoscience & Nanotechnology
Jaydeep Joshi, Benedikt Scharf, Igor Mazin, Sergiy Krylyuk, Daniel J. Campbell, Johnpierre Paglione, Albert Davydov, Igor Zutic, Patrick M. Vora
Summary: Interfaces in layered heterostructures provide a fertile ground for exploring new physics. This article investigates an unexpected photoluminescence peak at the interface between TiSe2 and MoSe2, which disappears at the charge density wave transition. The results present a challenge for theoretical understanding and offer a fascinating avenue for engineering excitons through interactions with charge density waves.
Article
Chemistry, Physical
Max Hering, Francesco Ferrari, Aleksandar Razpopov, Igor I. Mazin, Roser Valenti, Harald O. Jeschke, Johannes Reuther
Summary: We investigate the magnetism of a previously unexplored distorted spin-1/2 kagome model and uncover a rich ground state phase diagram even at the classical level. Through analytical arguments and numerical techniques, we identify different magnetic phases and predict the ground state of a newly synthesized material.
NPJ COMPUTATIONAL MATERIALS
(2022)
Editorial Material
Physics, Multidisciplinary
Igor Mazin
Summary: Scientists tend to prefer simple explanations, but there is a worrying trend towards unnecessarily complex interpretations.
Article
Multidisciplinary Sciences
Darshana Wickramaratne, I. I. Mazin
Summary: In this study, the authors provide an alternative explanation for the non-monotonic behavior of the superconducting transition temperature in NbSe2-xSx monolayer alloys based on the effects of alloying and defects on the electronic structure and magnetism.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Peter E. Siegfried, Hari Bhandari, David C. Jones, Madhav P. Ghimire, Rebecca L. Dally, Lekh Poudel, Markus Bleuel, Jeffrey W. Lynn, Igor I. Mazin, Nirmal J. Ghimire
Summary: The Fermi surface is essential for understanding the properties of metals. In this study, the authors investigate magnetotransport in the kagome magnet YMn6Sn6 and observe two manifestations: an enhancement of magnetoresistance driven by changes in the magnetic structure, and a reduction in resistivity driven by a magnetization-driven Lifshitz transition. These phenomena provide insights into the interplay of magnetism and electronic topology.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Tiema Qian, Eve Emmanouilidou, Chaowei Hu, Jazmine C. Green, Igor I. Mazin, Ni Ni
Summary: This study demonstrates the multiple metamagnetic transitions induced by external pressure in topological van der Waals magnets, providing a new avenue for efficient magnetic manipulation in these materials.
Article
Materials Science, Multidisciplinary
Gyanu P. Kafle, Charlsey R. Tomassetti, Igor I. Mazin, Aleksey N. Kolmogorov, Elena R. Margine
Summary: By analyzing the contribution of different electronic states, we demonstrate that the critical temperature (Tc) of LiB may exceed 32 K and explain the detrimental effect of pressure and doping on its superconducting properties. We also find metastable phases in Li-Mg-B binary and ternary layered materials with Tc close to or higher than the record 39 K value in MgB2. By reevaluating the stability of the Li-B binary phase, we identify a possible route to synthesize LiB superconductor at lower pressures achievable in multianvil cells.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
David A. S. Kaib, Kira Riedl, Aleksandar Razpopov, Ying Li, Steffen Backes, Igor I. Mazin, Roser Valenti
Summary: Motivated by the metallic behavior of RuI3 in contrast to the Mott-insulating nature of alpha-RuCl3 and RuBr3, this study provides a comparative analysis of the electronic and magnetic properties of these trihalides. First-principles calculations and effective-model considerations suggest that RuI3 is possibly on the verge of a Mott insulator but with smaller magnetic moments and strong magnetic frustration. The ideal pristine crystal of RuI3 is predicted to have a nearly vanishing conventional nearest-neighbor Heisenberg interaction, making it a potential quantum spin liquid candidate. The study also offers an explanation for the observed metallicity in existing samples of RuI3 and presents a magnetic Hamiltonian for the Mott insulator RuBr3.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Bongjae Kim, Sergii Khmelevskyi, Cesare Franchini, I. I. Mazin
Summary: In this study, the counterintuitive appearance of an ordered magnetic state in uniaxially strained Sr2RuO4 beyond the Lifshitz transition is explained using first-principles density-functional calculations and Moriya's self-consistent renormalization theory. It is found that strain weakens the quantum spin fluctuations, which destroy the static order, more strongly than the tendency to magnetism. The different rate of decrease of the spin fluctuations versus magnetic stabilization energy promotes the onset of a static magnetic order beyond a critical strain.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Bishal Thapa, Xin Jing, John E. Pask, Phanish Suryanarayana, Igor I. Mazin
Summary: We investigate the source of error in the Thomas-Fermi-von Weizsacker (TFW) density functional relative to Kohn-Sham density functional theory (DFT). Through numerical studies on a range of materials, we find that the energy deviation between TFW and Kohn-Sham is caused by the poor representation of linear response in TFW approximation for electronic kinetic energy. However, using TFW electronic ground state density, the energy computed from a non-self-consistent Kohn-Sham calculation is in good agreement with that obtained from the fully self-consistent Kohn-Sham solution.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Simon A. J. Kimber, Jiayong Zhang, Charles H. Liang, Gian G. Guzman-Verri, Peter B. Littlewood, Yongqiang Cheng, Douglas L. Abernathy, Jessica M. Hudspeth, Zhong-Zhen Luo, Mercouri G. Kanatzidis, Tapan Chatterji, Anibal J. Ramirez-Cuesta, Simon J. L. Billinge
Summary: Using the energy-resolved variable-shutter pair distribution function technique, we found that GeTe materials at higher temperatures exhibit anisotropic and non-linear dynamics, resembling static disorder. Our Ginzburg-Landau model coupling polarization fluctuations explains the emergence of this anisotropy. By studying the time-dependent atomic correlations in energy materials, we reconcile the long-standing disagreement between local and average structure probes and demonstrate the ubiquity of spontaneous anisotropy in cubic IV-VI materials.
Article
Multidisciplinary Sciences
Edoardo Baldini, Alfred Zong, Dongsung Choi, Changmin Lee, Marios H. Michael, Lukas Windgaetter, Igor I. Mazin, Simone Latini, Doron Azoury, Baiqing Lv, Anshul Kogar, Yifan Su, Yao Wang, Yangfan Lu, Tomohiro Takayama, Hidenori Takagi, Andrew J. Millis, Angel Rubio, Eugene Demler, Nuh Gedik
Summary: Detecting the excitonic insulator phase in candidate materials is crucial for its potential in superfluid energy transport. However, the coexistence of a structural order parameter hinders the identification of this phase in real solids. Ta2NiSe5 is believed to have a dominant excitonic phase, but our study suggests that the symmetry breaking in this material is mostly structural in nature, hampering quasi-dissipationless energy transport.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Physical
S. Das, H. Paudyal, E. R. Margine, D. F. Agterberg, I. I. Mazin
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
I. I. Mazin
Summary: MnTe has been recently studied as a potential candidate for alternative magnetism. It exhibits a unique magnetic order with ferromagnetic ab planes and antiferromagnetic stacking along c. This special magnetic order opens up possibilities for manufacturing detwinned samples with alternative magnetism and generating observable magneto-optical response as a signature, which we calculate using first principles.
Article
Chemistry, Physical
Blair F. Kennedy, Simon A. J. Kimber, Stefano Checchia, A. K. M. Ashiquzzaman Shawon, Alexandra Zevalkink, Emmanuelle Suard, Jim Buckman, Jan-Willem G. Bos
Summary: Using mixtures of aliovalent elements to achieve a valence balanced electronic state is a rapidly emerging area in half-Heusler thermoelectric materials research. The study introduces Zn0.5Ti0.5NiSb as a promising material that can be made p- and n-type by adjusting the Zn/Ti-ratio, achieving high zT values. Transport data and diffraction experiments reveal a low lattice thermal conductivity and similar weighted electronic mobilities, indicating the potential for similar zT values in both polarity types.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)